bitcoin is a double edged sword on one hand using it provides security on the internet since no one can trace you down and on the other hand it provides a big opportunity for hackers and black market dealers that use it for selling drugs and other illegal stuff since it provides anonymity,but it all depends on the person that is using it
The bitcoin is not totally anonymous. It is pseudo anonymous. So you can be traced by using the bitcoin.
That is true. As the trail can't be destroyed in blockchain, the user can be tracked back with varying levels of ease. However, if the user mixes his coins, then it takes a lot of time and effort to track him (an example is Tomá Jiřikovský, the Sheep Marketplace thief).
Nowadays, mixing service is very popular especially when you are doing an illegal activities. True, you can trace the bitcoin address for the transaction but it's hard to determine who are the people transacting. It's the benefits of using bitcoin but we do not need to abuse it as it might not give us a good benefits.